The primary focus of Microsoft .NET Framework 1.0 Service Pack 3 (SP3) is improved security. In addition, the service pack includes roll-ups of all reported customer issues found after the release of the Microsoft .NET Framework 1.0. Of particular note, SP3 provides better support for consuming WSDL documents, Data Execution prevention and protection from security issues such as buffer overruns.

SP3 also provides support for Windows XP Service Pack 2 to provide a safer, more reliable experience for customers using Windows XP.

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The Microsoft .NET Framework 4 web installer package downloads and installs the .NET Framework components required to run on the target machine architecture and OS. An Internet connection is required during the installation. .NET Framework 4 is required to run and develop applications to target the .NET Framework 4.

The Microsoft Visual C++ 2010 Redistributable Package installs runtime components of Visual C++ Libraries required to run applications developed with Visual C++ on a computer that does not have Visual C++ 2010 installed.